Select

Overview

The select field creates a simple select dropdown. You are able to select one or multiple values from the predefined list.

Screenshot

select

Settings

Besides the common settings, this field has the following specific settings:

Name	Description
`options`	Array of `'value' => 'Label'` pairs. They’re used to display choices. `value` is stored in the custom field. Required.
`multiple`	Whether to allow select multiple values? `true` or `false` (default).
`placeholder`	The placeholder text.
`select_all_none`	Display “Select All / None” button to fast toggle choices. Applied only when `multiple` is `true`.
`flatten`	Display sub items without indentation. `true` or `false` (default).

Sample code

array(
    'name'            => 'Select',
    'id'              => $prefix . 'select',
    'type'            => 'select',
    // Array of 'value' => 'Label' pairs
    'options'         => array(
        'java'       => 'Java',
        'javascript' => 'JavaScript',
        'php'        => 'PHP',
        'csharp'     => 'C#',
        'objectivec' => 'Objective-C',
        'kotlin'     => 'Kotlin',
        'swift'      => 'Swift',
    ),
    // Allow to select multiple value?
    'multiple'        => true,
    // Placeholder text
    'placeholder'     => 'Select an Item',
    // Display "Select All / None" button?
    'select_all_none' => true,
),

Define list that includes sub-items:

'options' => array(
        array( 'value' => 'monkeys', 'label' => 'Monkeys' ),
        array( 'value' => 'king_kong', 'label' => 'King Kong', 'parent' => 'monkeys' ),
        array( 'value' => 'curious_george', 'label' => 'Curious George', 'parent' => 'monkeys' ),
        array( 'value' => 'donkeys', 'label' => 'Donkeys' ),
        array( 'value' => 'eeyore', 'label' => 'Eeyore', 'parent' => 'donkeys' ),
        array( 'value' => 'guss', 'label' => 'Gus', 'parent' => 'donkeys' ),
    ),
    // Show parent items and sub-items at same level
    'flatten' => false, 

Data

If multiple is false, this field simply saves the selected value in the database. The value saved is the value in the options array (not label).

If multiple is true, this field saves multiple values in the database, where ech value is store in a single row in the database with the same meta key (similar to what add_post_meta does with last parameter false).

If the field is cloneable, then the value is stored as a serialized array in a single row in the database.

Template usage

If field is not multiple:

$value = rwmb_meta( $field_id );
echo $value;

If field is either multiple or cloneable:

$values = rwmb_meta( $field_id );
foreach ( $values as $value ) {
    echo $value;
}

If field is both multiple and cloneable:

$values = rwmb_meta( $field_id );
foreach ( $values as $clone ) {
    foreach ( $clone as $value ) {
        echo $value;
    }
}

The function rwmb_meta() only returns the value of the field, e.g. the key in the options array. To display the field label, use this code:

rwmb_the_value( $field_id );

Depends on the value is a single value or an array (multiple or cloneable or both), this function outputs a simple string or an unordered list.

Read more about rwmb_meta() and rwmb_the_value().